The offensive line, which allowed a NFL-high 58 sacks last season, will have five new starters when training camp begins. Getting this unit playing together will likely be the biggest focus of training camp, even ahead of making sure quarterback Ryan Tannehill is sharp. It all starts up front.

A lot of pressure will be on head coach Joe Philbin, offensive coordinator Bill Lazor and offensive line coach John Benton to whip the line into shape during training camp.

Not having Pro-Bowl center Mike Pouncey (hip surgery) is a major setback. Pouncey is arguably Miami's best offensive player. Without Pouncey, left tackle Branden Albert is the only starting offensive lineman who has been a regular NFL starter. That showed during OTAs (Organized Team Activities) and minicamp.

"We've obviously got a lot of work still to do," right guard Shelley Smith said, "but we'll build off of the things we're doing at minicamp and be ready to go for training camp and the season."

As for Lazor's new offense, it needs to be clicking early in the season. The Dolphins open Sept. 7 against New England, always a tough matchup, and Sept. 14 at Buffalo, where they've lost the last two years.

It'll be important for the Dolphins' offense to put points on the board for these two AFC East opponents. That means getting things right in training camp.

Tannehill was fairly proficient at running the new system during OTAs and minicamp, but things were far from smooth, which was to be expected. The Dolphins didn't show much quick-strike scoring ability and still had busted routes and dropped passes.

The Dolphins need an accelerated learning curve for everyone, and they'll be doing that with an unsettled running back position (Knowshon Moreno might miss the first week or so of training camp after knee surgery) and an unfamiliar offensive line.

Defensively, the Dolphins switched Misi (from strong side to middle) with Ellerbe (from middle to strong side) and it was tough to tell how well it worked OTAs and minicamp because there were no pads.

During training camp, this switch needs to show results. The linebackers were the weak link last season on a unit in which the defensive line was good and the secondary was good enough. If the linebackers can't stop the run and control the middle of the field, the defense has no chance of being a game-changing force, which is its goal.

Miami made major changes in the offseason, and the most important changes -- fixing the offensive line, changing the offensive scheme, and addressing deficiencies at linebacker -- will be the focus of training camp.

CAMP CALENDAR

Players report: July 24

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NFL Team Report - Miami Dolphins - NOTES, QUOTES

--Running back Lamar Miller could open training camp as the starter because Knowshon Moreno had surgery on his left knee and could be sidelined when camp opens in late July.

The news that Moreno required surgery could explain a couple of things. Moreno reported to OTAs a bit heavy, especially in the face and stomach. Moreno was also unable to unseat Miller and Daniel Thomas to take snaps with the first- and second-team offense.

Moreno, who had more than 1,500 yards from scrimmage last season with Denver, was signed with the expectation he'd become the starter.

--Quality depth remains a concern. The offensive line is suspect once again and tight end could also be a concern. The defensive backs have volume as far as backups, but it's not known whether they're NFL-caliber players.

Injuries are inevitable, and if they come at the wrong positions, such as center with Mike Pouncey being sidelined three months after hip surgery, it could be a major problem. The Dolphins could probably absorb injuries at wide receiver, defensive line, quarterback, running back and linebacker, but in other positions they're fairly thin.

--One of the focal points of training camp will be the starting linebacker trio. Middle linebacker Koa Misi, strong-side linebacker Dannell Ellerbe and weak-side linebacker Philip Wheeler seemed OK during OTAs and minicamp, but that was without pads.

The linebackers were viewed as the weak link of the defense last season and instead of acquiring a new linebacker the Dolphins merely switched Misi and Ellerbe. If this experiment doesn't work, the defense is probably no better than it was a year ago. If the experiment does work, Miami's defense could take a huge step forward.

--Dolphins defensive end Dion Jordan was suspended four games for violating the NFL's policy on performance enhancing substances, the league announced.

Jordan, the No. 3 overall draft pick in 2013, recently said he had gained 17 pounds of muscle compared to last season, according to ESPN.com. He posted just 26 tackles and two sacks in limited playing time as a rookie.

"We were disappointed to learn about Dion's suspension," Dolphins coach Joe Philbin said in a statement. "Dion has accepted responsibility for his actions and is committed to improving, both on and off the field, in preparation for the upcoming year."

Jordan will be eligible to return to the Dolphins' active roster on Monday, Sept. 29 following the team's Sept. 28 game against the Oakland Raiders.

"I recently learned from the NFL that I tested positive for stimulants that are banned under the NFL policy," Jordan said in a statement. "I worked carefully with my advisors and the union to investigate the test results, and I take full responsibility for the test results.

"I'm very sorry for the impact of this situation on my teammates, coaches, (owner) Stephen Ross, the entire Dolphins organization, fans and my family as well. I will continue to work extremely hard during training camp and preseason. During the suspension, I will stay in top shape and will be ready to contribute upon my return."

Jordan is eligible to participate in all preseason practices and games.

--The Dolphins signed Daryn Colledge to a one-year deal to bolster the depth along their revamped offensive line. Colledge spent the past three seasons with the Arizona Cardinals following five seasons with the Green Bay Packers.

Colledge is familiar with Dolphins head coach Joe Philbin, who was the Packers' offensive line coach in 2006 and offensive coordinator from 2007-11. Colledge has appeared in 128 career games, including 124 starts.

The Dolphins were seeking veteran depth with center Mike Pouncey expected to miss at least three months following hip surgery last month. They lacks a proven true center to take his place. Colledge, 32, has spent the bulk of his career at guard, with right guard Shelley Smith a possibility to move to center unless the Dolphins want to go with one of Pouncey's backups - Sam Brenner or Nate Garner.

"We are happy to reach an agreement with Daryn Colledge," said Dolphins general manager Dennis Hickey. "Daryn is a proven player who brings a tremendous amount of experience and versatility to the organization. He is a welcome addition to our offensive line room."

A lot of the wide receivers' success will depend on quarterback Ryan Tannehill and the offensive line's ability to protect Tannehill. But the as a group, the wide receivers are grown men.

--Breakout player: Linebacker Jelani Jenkins.

The 2013 fourth-round pick from Florida, has an intriguing tool set that makes you think he'll be an impact player very soon. Jenkins (17 tackles in 2013) is an active player and a sure tackler. He shows good sideline-to-sideline speed and solid instincts. He began to make a name last season on special teams and later as a linebacker in the nickel package. He's a reserve, but look for Jenkins to be a leading special teams player and someone who earns a spot in a defensive package. He's a good candidate to become a playmaker.

--Fantasy football reality check: Wide receiver Jarvis Landry.

Expect the rookie second-round pick from LSU to be a major factor in the offense. Yes, it's a crowded field for catching passes among wide receivers Mike Wallace, Brain Hartline and Brandon Gibson, as well as tight end Charles Clay. But Landry makes plays. He'll find a way to make a splash as an inside receiver, outside receiver or red-zone target.

Tannehill (24 touchdowns, 17 interceptions) has to master a new offense that gives him more pre-snap responsibilities. The offense features lots of motion and it's up to Tannehill to get everybody lined up in the right spots. On a personal level, Tannehill (81.7 passer rating, 24th in NFL) has to show he's improved his pocket presence and ability to throw the deep ball. Many of last season's NFL-worst 58 sacks came because Tannhill held the ball too long or didn't feel the pressure. As for the deep ball, Tannehill has the arm strength but he lacks accuracy. If Tannehill can make these improvements he could take the next step in his growth.

Moreno, who had more than 1,500 yards from scrimmage last season with Denver, was acquired to be a three-down back. Ideally he will be on the field in running, passing or short-yardage situations. That's an asset Miami didn't have last season with Miller and Thomas carrying most of the load. Upgrading the position is essential. The Dolphins rushed for 90 yards a game as a team, which ranked 26th in the NFL. Worse, the running backs were bad in pass protection, too, and they share some of the blame for the 58 sacks allowed. If Moreno is as good as advertised, Miami is OK. If not, they're in the same spot they were in last season. A knee injury he suffered in the offseason is a concern.

Clay had a breakout season a year ago with 69 receptions for 759 yards and six touchdowns. If he can repeat that performance with defenses zeroing in on him, he's legit. If not, Miami is in trouble. None of the other tight ends has showed he's NFL caliber. Sims needs to improve his play speed and Egnew, while a decent blocker, needs to improve his hands. The Dolphins need a red-zone target and if it's not Clay they don't have an answer for that role at tight end.

This is a reliable veteran unit that could blow up into a playmaking unit. One key is Wallace (73 receptions, 930 yards, five touchdowns). His ability to connect with QB Ryan Tannehill on the deep ball would give this offense the element it's lacked for years. Hartline (1,016 yards) has had back-to-back 1,000-yard seasons. And if Gibson (knee) can stay healthy, he'll prove valuable as a slot receiver. Landry seems to be a playmaker and could add a dynamic element from the slot or outside. Matthews could provide even more quality depth.

This remains a major concern. Miami seems to have upgraded in talent with Albert, the Pro-Bowl player signed from Kansas City, and James, the first-round pick from Tennessee. And the Dolphins seem to have linemen better suited for the zone blocking scheme. But they'll also take the field for the opener with five new starters. That's not ideal. And with Pouncey (hip) out for all of training camp and possibly the first two games, things get more complicated as far as learning a new offense and communicating. Depth is also a concern. Keep an eye on this unit.

This should be the group that leads the team. The tackles won't be as strong as last season without Paul Soliai (Atlanta), but the tackle trio is still strong among Starks, Odrick and Mitchell. And the defensive ends could develop into one of the strongest units in the AFC with Vernon (11.5 sacks) and Wake (8.5 sacks) leading the way and Jordan and Shelby as reserves. Jordan will miss the first four games of the season on a league suspension. The key is whether the Dolphins can stop the run. Miami was 24th in rushing defense last season at 124.9 yards allowed. They should be pretty good at pass rushing.

There are concerns here. This group was viewed as the reason the run defense struggled and they're bringing back the same three guys, although Misi and Ellerbe switched positions. The idea behind the change was to get Ellerbe on the outside where he's most comfortable. The key is whether Misi can play a position he's never played. Misi is a sure tackler and is athletic, but it's tough to say whether he's a middle linebacker. Keep an eye on Jenkins. He's developing and could see time in the nickel package.

Grimes is money. Jones is OK. Delmas and Finnegan are almost reclamation projects, so that's where the questions begin. As for depth, Miami has good special teams players among Wilson, Thomas, Taylor, Davis, Kovacs and Brown. But they still have to prove they can play from scrimmage. Wilson, the nickel back, could be ready to make a move. He was solid last season and seems to have improved during the offseason. If Miami can find a playmaker in addition to Grimes, this unit could be strong. If not, they'll be so-so, and this defense needs more than so-so.

Fields is among the best punters in the NFL, so he's not a problem. Denney is a Pro-Bowl player, so he's also not a problem. Sturgis (26-for-34 on field goals) had a midseason hiccup, but he recovered. Still, there's a bit of a worry about how he'll handle an entire season in which his performance will likely be a huge key. As for the other special teams units, the Dolphins ranked fourth last season in the widely-accepted ratings of Rick Gosselin of the Dallas Morning News. Miami's special teams have been in Gosselin's top eight in the NFL for each of the last three seasons.